This opportunity is for NSN 7R-1680-014833183-KB, quantity 19 each, with delivery FOB origin. The item is flight critical and requires Government source approval before contract award, so only previously approved sources have been solicited. Alternate sources must qualify under Government-approved procedures and submit the required source approval data with their offer. The Government is not using commercial item acquisition procedures under FAR Part 12. Award cannot be delayed pending approval of a new source; interested commercial item suppliers may identify their capability to the contracting officer.